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EP3039071B1 - Compositions toucher doux et articles obtenus à partir de celles-ci - Google Patents

Compositions toucher doux et articles obtenus à partir de celles-ci Download PDF

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EP3039071B1
EP3039071B1 EP14786295.7A EP14786295A EP3039071B1 EP 3039071 B1 EP3039071 B1 EP 3039071B1 EP 14786295 A EP14786295 A EP 14786295A EP 3039071 B1 EP3039071 B1 EP 3039071B1
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Prior art keywords
composition
ethylene
specifically
total weight
polypropylene
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EP3039071A1 (fr
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Jana HRACHOVA
Franciscus Elisabeth Jacobus Essers
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SABIC Global Technologies BV
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SABIC Global Technologies BV
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/40—Glass
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
    • C08L23/0815—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic 1-olefins containing one carbon-to-carbon double bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Ethene-propene or ethene-propene-diene copolymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/02—Heterophasic composition

Definitions

  • the present disclosure relates to polyolefin compositions, and in particular to blended polyolefinic materials, which, after molding, provide a soft touch feel.
  • Soft touch materials have found applications in many industries. For example, soft touch materials can be utilized in automotive interior components such as trim components, grips on steering wheels, and shifters. Electronic industries also utilize soft touch materials on the grips and protective coverings of handheld electronic devices. Other applications can vary, for example soft touch materials can be found in tool handles and tooth brushes.
  • One way to impart a soft touch feel is to use a multi-step process applying a secondary layer of functional material on top of a molded article through overmolding, painting, or other techniques.
  • Another way to impart a soft touch feel is to provide a material, which on its own, is suitable for producing articles having a soft touch feel.
  • a polymeric composition particularly, a polyolefin composition that can exhibit a relatively soft touch feel. It would be a further advantage if such a composition additionally has one or more of low gloss, good impact properties, good flexural properties, good tensile properties, good scratch resistance, and practical hardness values.
  • a soft touch composition comprising, based on the total weight of the composition, 50 to 88 wt% of a polymer comprising, based on the total weight of the polymer, 44 to 52 wt% of a polypropylene (PP) homopolymer, 3 to 30 wt% of an ethylene-propylene copolymer, and 22 to 52 wt% of an ethylene-C 4 to C 8 alpha olefin copolymer, and 10 to 40 wt% of glass fibers.
  • PP polypropylene
  • soft touch olefinic compositions having good mechanical properties can unexpectedly be obtained by combining different olefinic polymers in particular amounts.
  • Glass fibers can be present to further improve mechanical properties of the compositions.
  • an addition of silicone particles for example, methylsilsequioxane particles, unexpectedly improves the soft touch feel of the compositions without adversely affecting the melt flow properties, notched Izod impact properties, or surface properties of the compositions. It was also surprisingly found that in some instances the addition of the silicone particles actually improved the flexural and tensile properties, while providing desirable gloss properties.
  • a soft touch composition comprising, based on the total weight of the composition, 50 to 88 weight percent (wt%) of a polymer and 10 to 40 wt% of glass fibers, wherein the polymer comprises a polypropylene homopolymer, an ethylene-propylene copolymer, and an ethylene-C 4 to C 8 alpha olefin copolymer.
  • the soft touch composition can also comprise 60 to 70 wt%, specifically, 65 to 70 wt% of the polymer and 20 to 30 wt%, specifically, 20 to 25 wt% of glass fibers.
  • the soft touch composition can further comprise 0 to 10 wt% of an additive, specifically, 0.1 to 10 wt% based on the total weight of the composition.
  • the polymer component of the soft touch composition comprises a polypropylene homopolymer in an amount of 44 to 52 wt%, specifically, 45 to 50 wt%, more specifically, 47 to 49 wt%, based on the total weight of the polymer component.
  • the polypropylene homopolymer can have a melt flow index of 5 to 150 grams per 10 minutes (g/10 min), specifically, 10 to 150 g/10 min, more specifically, 10 to 70 g/10 min, measured at 230°C under 2.16 kilogram (kg) force according to ISO 1133.
  • An ethylene-propylene copolymer can be present in the polymer component of the soft touch composition in an amount of 3 to 30 wt%, specifically, 5 to 20 wt%, more specifically, 10 to 15 wt%.
  • a cold xylene soluble fraction of the ethylene-propylene copolymer can have an intrinsic viscosity of 2 to 8 deciliters per gram (dl/g), specifically, 2.5 to 6.5 dl/g measured in decalin at 135 degrees Celsius (°C).
  • a cold xylene soluble fraction of the ethylene-propylene copolymer can have an intrinsic viscosity of greater than 3, more specifically, greater than 4, measured in decalin at 135°C.
  • the extraction of cold xylene soluble fraction (CXS) is performed at 25°C according to ISO-16152.
  • the ethylene-propylene copolymer can be a random or block copolymer.
  • the copolymer is derived from at least propylene and ethylene.
  • the ethylene-propylene copolymer can comprise 55 to 95 wt%, specifically, 80 to 95 wt% polypropylene and 5 to 45 wt%, specifically, 5 to 20 wt% ethylene based on the total weight of the ethylene-propylene copolymer.
  • the polymer component of the soft touch composition further comprises an ethylene-C 4 to C 8 alpha olefin copolymer in an amount of 22 to 52 wt%, specifically, 28 to 46 wt%, more specifically, 33 to 40 wt%, based on the total weight of the polymer component.
  • the ethylene-C 4 to C 8 alpha olefin copolymer can be a random or block copolymer derived from ethylene and at least one C 4 to C 8 alpha olefin.
  • Exemplary C 4 to C 8 alpha olefins include 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, and 1-octene, among which, 1-octene is specifically mentioned.
  • the ethylene content of said copolymer can vary widely, for example, 40 to 80 wt%, specifically, 50 to 75 wt%, more specifically, 60 to 75 wt%.
  • the ethylene-C 4 to C 8 alpha olefin copolymer can have a density of 850 to 880 kilogram per meter cubed (kg/m 3 ) and a melt flow index of 0.5 to 35 g/10 min, specifically, 1 to 30 g/10 min, more specifically, 2 to 10 g/10 min, even more specifically, 4 to 6 g/10 min, measured at 190°C under 2.16 kg force according to ISO 1133.
  • the polymer component of the soft touch composition can be prepared by combining a polypropylene homopolymer and an ethylene-propylene copolymer together as a first component and an ethylene-C 4 to C 8 alpha olefin copolymer as a second component.
  • the first component can be heterophasic comprising at least two phases, for example, a crystalline polypropylene homopolymer-based matrix and a dispersed ethylene-propylene elastomeric phase.
  • the first component can be prepared in one or more reactors, by polymerization of, for example, propylene in the presence of a catalyst, and subsequent polymerization of a propylene-ethylene mixture, but can also be prepared by blending the polypropylene and the ethylene-propylene copolymer components.
  • the specific morphology of the resulting heterophasic structure is dependent upon the preparation method and the monomers from which the polymers were derived and their relative amounts.
  • the heterophasic structure can comprise greater than or equal to 20 wt%, specifically, 50 to 95 wt% of a crystalline propylene homopolymer matrix, and 5 to 50 wt% of a dispersed copolymer of ethylene and propylene, based on the total amount of the heterophasic composition.
  • the amount of dispersed phase can be 10 to 50 wt%, specifically, 15 to 35 wt%, more specifically, 20 to 35 wt%, even more specifically, 17 to 25 wt% based on the total amount of heterophasic composition.
  • the melt flow index (MFI) of the heterophasic composition (measured in accordance with ISO 1133 using a 2.16 kg weight and at a temperature of 230°C) can be 1 to 100 g/10 min, for example, 10 to 40 g/10 min.
  • the melt flow index (MFI) of the heterophasic composition (measured in accordance with ISO 1133 using a 2.16 kg weight and at a temperature of 230°C) can be less than or equal to 65 g/10 min, specifically, 1 to 65 g/10 min.
  • a cold xylene soluble fraction of the heterophasic composition can have an intrinsic viscosity of 1.5 to 6 dl/g, specifically greater than 3, measured in decalin at 135°C.
  • a cold xylene insoluble fraction (CXI) of the heterophasic composition can have an intrinsic viscosity of 1 to 3 dl/g, measured in decalin at 135°C. The extraction of CXS and CXI is performed at 25°C according to ISO16152.
  • the composition comprises glass fibers.
  • the glass fibers, as added to the composition can comprise long and/or short glass fibers.
  • Long glass fibers can have an average length of greater than or equal to 1 millimeter (mm), specifically, the long glass fibers can have a length of 1 to 50 mm, specifically, 1 to 20 mm, more specifically, 5 to 15 mm.
  • Short glass fibers can have a length of less than 1 mm. The length of the added glass fibers can decrease during processing and as such the final length of the glass fibers in the composition can be less than that of the added glass fibers.
  • the diameter of the glass fibers can be 5 to 50 micrometers, specifically, 8 to 30 micrometers, more specifically, 10 to 20 micrometers.
  • the glass fiber can be a coated glass fiber and can be prepared from continuous lengths of fibers by, for example, a sheathing or wire-coating process, by crosshead extrusion, or by a pultrusion technique. Using these technologies, fiber strands impregnated or coated with a polymer are formed. The fiber can then be cut into a desired length and can optionally be formed into pellets or granules. The fibers can be further processed, e.g. by injection moulding or extrusion processes, into a composition.
  • the composition can comprise 0 to 10 wt% of silicone particles, specifically, 1 to 5 wt%, more specifically, 0.1 to 2 wt% of silicone particles based on the total weight of the composition.
  • the composition can comprise 4 to 6 wt% of silicone particles based on the total weight of the composition.
  • the silicone particles can be, for example, spherical, oblong, ovoidal, cylindrical, or a combination comprising one or more of the foregoing.
  • the silicone particles can be essentially spherical in shape and can have a mean bead diameter of 1.8 to 10.5 micrometers, specifically, 2 to 10 micrometers, more specifically, 5 to 7 micrometers.
  • the bulk specific gravity of the silicone particles is 0.35 to 0.67 kilograms per liter (kg/l).
  • the addition of the silicone particles can result in an improvement in the haptic properties as compared to a composition without said particles.
  • Silicone particles comprise a three-dimensional polymer chain of the formula (I): R x SiO 2-(x/2) (I) in which x is a positive number greater than or equal to 1, specifically, 1 to 1.9, more specifically, 1 to 1.5, and even more specifically, 1 to 1.2; and each R is independently an organic group, such as an aliphatic hydrocarbon group, e.g., methyl, ethyl, or butyl; or an aromatic hydrocarbon, e.g., phenyl, and can comprise an unsaturated group, e.g., vinyl.
  • R x SiO 2-(x/2) (I) in which x is a positive number greater than or equal to 1, specifically, 1 to 1.9, more specifically, 1 to 1.5, and even more specifically, 1 to 1.2; and each R is independently an organic group, such as an aliphatic hydrocarbon group, e.g., methyl, ethyl, or butyl; or an aromatic hydrocarbon, e.g., pheny
  • R is a hydrocarbon group having 1 to 8, specifically, 1 to 5, carbon atoms, more specifically, methyl.
  • silicon resin particles comprise methylsilsequioxane.
  • Suitable silicone particles are commercially available from Momentive Performance Materials Japan LLC, under the name of "Tospearl” silicone resin particles. These particles have a three-dimensional network structure in which each silicone atom is bonded to one methyl group.
  • the soft touch composition can comprise a modified polypropylene that can result in improved properties by affecting glass fiber-polypropylene interactions.
  • suitable modified polypropylenes are polypropylenes grafted with for example an unsaturated organic compound, such as a carboxylic acid, an anhydride, an ester, or salts thereof.
  • Suitable examples include maleic, fumaric, (meth)acrylic, itaconic or cinnamic acid or anhydride, ester or salt thereof.
  • Suitable examples include maleic, fumaric, (meth)acrylic, itaconic or cinnamic acid or anhydride, ester or a salt thereof, among which, maleic anhydride is specifically mentioned.
  • the grafted groups can be presented in an amount of greater than or equal to 0.5 wt%, specifically, greater than or equal to 0.7 wt%, based on the total weight of the modified polypropylene.
  • the density of the modified polypropylene can be 0.8 to 1.0 g/cm 3 , for example about 0.9 g/cm 3 .
  • the melt flow index of the modified polypropylene (measured in accordance with ISO 1133 using a 2.16 kg weight and at a temperature of 230°C) can be greater than or equal to 25 g/10 min, for example, greater than or equal to 100 g/10 min.
  • the modified polypropylene can be produced by reactive extrusion.
  • modified polypropylene comprises modified homopolypropylene, for example, maleic anhydride functionalized homopolypropylene produced by reactive extrusion.
  • modified polypropylene can vary widely, but for economical reasons the amount normally will be rather low, for example, less than or equal to 5 wt%, specifically, less than 4, 3, 2 or even 1 wt%, based on total weight of the composition.
  • the modified polypropylene can be present in an amount of 0.1 to 4 wt%, based on the total weigh of the composition.
  • the composition can comprise an additive including a nucleating agent, a clarifier, a release agent, a plasticizer, an antioxidant, a stabilizer (such as a thermal stabilizer, a visible light stabilizer, an ultraviolet light stabilizer (such as a hindered amine light stabilizer), and an antioxidant), a colorant, a flame retardant, a lubricant (such as calcium stearate), a synergist, a mold release agent, a flow enhancer, an anti-static agent, a glass filler, a filler that is different from the glass filler (such as talc), a scratch resistant additive (such as a silicone, a low density polyethylene that can be a long chain branched low density polyethylene), or a combination comprising at least one of the foregoing.
  • a nucleating agent such as a clarifier, a release agent, a plasticizer, an antioxidant, a stabilizer (such as a thermal stabilizer, a visible light stabilizer, an ultraviolet light stabilizer (such
  • the additive can be present in an amount of 0.5 to 20 wt%, specifically, 2 to 15 wt%, based on the total weight of the composition.
  • the additive can be present in an amount of 0 to 10 wt%, specifically, 2 to 10 wt%, based on the total weight of the composition.
  • the composition can comprise a processing aide such as a polysiloxane, where the polysiloxane can comprise an ultrahigh molecular weight polysiloxane with a kinematic viscosity of larger than 10x10 6 centistokes (cSt) determined in accordance with ASTM D445 Kinematic Viscosity.
  • the polysiloxane can be added to the composition as a polymer dispersion, where the polysiloxane is dispersed in a polymer matrix, for example, in polypropylene.
  • the polypropylene matrix can comprise the above mentioned polypropylene, specifically, the polypropylene matrix can comprise a polypropylene homopolymer.
  • the siloxane content of the dispersion can be 40 to 60 wt%, for example about 50 wt%, based on the total weight of the dispersion.
  • the siloxane comprises polydimethyl siloxane or functionalized polydimethyl siloxane.
  • An example of such a polysiloxane processing aide is MB50-001 Masterbatch, commercially available from Dow CorningTM.
  • the processing aide can be present in an amount of 0.2 to 10 wt%, specifically, 0.2 to 5 wt%, more specifically, less than or equal to 1 wt%, even more specifically, less than or equal to 0.5 wt%, based on the total weight of the composition.
  • the composition can comprise 0.1 to 1 wt% of oleamide and/or erucamide based on the total weight of the composition.
  • Oleamide and erucamide are the amides of fatty acids oleic acid and erucic acid, and have molecular formula C 18 H 35 NO and C 22 H 43 NO, respectively.
  • Such an amount of fatty acid amide can decrease the visibility of surface damage like scratches on a molded article. Accordingly, the amount of fatty acid amide can be less than or equal to 1 wt %, specifically, 0.1 to 0.6 wt% based on the total weight of the composition.
  • Compositions comprising greater than 1 wt%, specifically, greater than or equal to 1.5 wt% can experience excessive migration of the compound to the surface of the molded article and cause problems like stickiness etc.
  • colorant such as carbon black or pigments.
  • the colorant can be present in an amount of 0.1 to 5 wt%, specifically, 0.5 to 4 wt% based on the total weight of the composition.
  • Stabilizers including, for example, a UV stabilizer, a visible light stabilizer, a thermal stabilizer, an antioxidant, or a combination comprising at least one of the foregoing can be present in an amount of 0.1 to 2 wt%, specifically, 0.2 to 1 wt%, more specifically, 0.3 to 0.8 wt% based on the total weight of the composition.
  • the composition can be made by, for example, mixing all of the components in an extruder, to obtain the composition of pellet or granule form or the composition can be formed by mixing all of the components minus the glass filler in an extruder, to obtain the composition of pellet or granule form and subsequently mixing in the glass filler.
  • the composition can also be made by blending different pellets of different compositions.
  • the composition prior to the addition of the glass filler can have a melt flow index of 0.1 to 100 g/10 min, specifically, 10 to 40 g/10 min as measured in accordance with ISO 1133 using a 2.16 kg weight at a temperature of 230°C.
  • An article made from the composition can have a notched Izod impact value as determined according to ISO 180/4A (2000) as measured at 23°C of greater than or equal to 25 kilojoules per meter squared (kJ/m 2 ), specifically, greater than or equal to 30 kJ/m 2 (parallel) and/or of greater than or equal to 20 kJ/m 2 , specifically, greater than or equal to 29 kJ/m 2 (perpendicular).
  • An article made from the composition can have a parallel notched Izod impact value as determined according to ISO 180/1A (2000) of greater than or equal to 20 kJ/m 2 , specifically, greater than or equal to 28 kJ/m 2 as measured at 23°C and/or of greater than or equal to 15 kJ/m 2 , specifically, greater than or equal to 20 kJ/m 2 as measured at 0°C and/or of greater than or equal to 8 kJ/m 2 , specifically, greater than or equal to 12 kJ/m 2 as measured at -20°C.
  • An article made from the composition can have a flexural modulus as determined according to the American Society for Testing and Materials (ASTM) D790 Procedure B measured at 23°C of (parallel) of greater than or equal to 1000 Newtons per millimeter squared (N/mm 2 ), specifically, greater than or equal to 1800 N/mm 2 and/or of greater than or equal to 800 N/mm 2 , specifically, greater than or equal to 1000 N/mm 2 (perpendicular).
  • Sample dimensions for determining flexural moduli were 65x12.7x3.2 mm with a support span L of 51 mm.
  • An article made from the composition can have a gloss measurements as determined according to ISO 2813 taken at 23°C of less than or equal to 20, specifically, less than or equal to 10 as determined at an angle of 20 degrees and/or lower than or equal to 45, specifically, less than or equal to 30 as determined at an angle of 60 degrees and/or less than or equal to 75, specifically, less than or equal to 60 as determined at an angle of 85 degrees.
  • An article made from the composition with a Volkswagen (VW) texture K59 can have a VW scratch resistance value as measured according to PV 3952 2002 scratch method of VW AG company on an Erichsen scratching device with a load 10 Newton (N) of a dL of less than 1.5, specifically, less than or equal to 0.5.
  • An article molded from the composition can be used in applications where aesthetic aspects (such as visible and/or tactile aspects are important). Such applications can be used as parts for automotive exterior and interior applications, or electrical appliances. Examples of automotive parts include bumper fascia, instrument panels, consoles, interior trim parts, door panels, door grips (e.g., interior), shift boot, and dash board.
  • melt flow index was determined according to the International Organization for Standardization (ISO) test standards ISO 1133 at 230°C under a load of 2.16 kilogram (kg).
  • the ash content was determined according to ISO 3451 measured after 15 minutes (min) at 525°C.
  • Notched Izod impact values were determined according to ISO 180/1A. Notched Izod impact parallel and perpendicular measurements were obtained at 23°C according to ISO180/4A and at -20°C according to ISO180/4A.
  • the flexural modulus and the flexural strength were determined at 23°C according to the ASTM D790 Procedure B and according to ISO 178.
  • ASTM D790 parallel and perpendicular measurements were done on 65x12.7x3.2 mm cut samples and ISO 178 measured on 80x10x4 mm molded bars.
  • Shrinkage measurements were determined according to ISO 294-4 (April 23, 1990). The sample size used was 65x65x3.2 mm with measurements taken 24 h at 23°C after molding and after 1 h at 90°C. Parallel shrinkage indicated is parallel to the flow direction, perpendicular is the shrinkage in cross flow direction. Shrinkage was measured on 5 samples and averaged.
  • Warpage measurements were determined by the ratio of shrinkage in the parallel and perpendicular direction. The temperature and time held at said temperature are listed in Table 3 for each test.
  • the Volkswagen (VW) scratch resistance test was measured according to PV 3952 2002 scratch method of VW AG company on an Erichsen scratching device with a load 10 Newton (N).
  • the resulting value, dL is a measure for the scratch resistance, where a low dL value corresponds to high scratch resistance and means that the scratch does not turn white but keeps the original color or the scratched plaque.
  • the dL should be less than 1.5, specifically, less than or equal to 0.5.
  • Hardness measurements were ball indentation hardness measurements as determined according to ISO 2039 Part 1 at a temperature of 23°C, a force of 132 Newtons for 30 seconds.
  • Friction measurements were determined according to ISO 8295 with loads adapted to 130 N for 35 seconds.
  • Table 1 Component Description
  • Source PP1 A heterophasic polymer comprising 18.5 wt% of ethylene-propylene copolymer dispersed in a polypropylene homopolymer, wherein the polypropylene homopolymer has a MFI of 70 measured at 230°C under a load of 2.16 kg according to ISO 1133, and a cold xylene soluble fraction of the ethylene-propylene copolymer has an intrinsic viscosity of 2.2 dl/g measured in decalin at 135°C.
  • SABIC's innovative Plastics business PP2 A heterophasic polymer comprising 24 wt% of ethylene-propylene copolymer dispersed in a polypropylene homopolymer wherein the polypropylene homopolymer has a MFI of 50 measured at 230°C under a load of 2.16 kg according to ISO 1133, and a cold xylene soluble fraction of the ethylene-propylene copolymer has an intrinsic viscosity of 3.0 dl/g measured in decalin at 135°C.
  • SABIC's innovative Plastics business PP3 A heterophasic polymer comprising 33 wt% of ethylene-propylene copolymer dispersed in a polypropylene homopolymer wherein the polypropylene homopolymer has a MFI of 50 measured at 230°C under a load of 2.16 kg according to ISO 1133, and a cold xylene soluble fraction of the ethylene-propylene copolymer has an intrinsic viscosity of 1.7 dl/g measured in decalin at 135°C..
  • SABIC's innovative Plastics business PP4 A heterophasic polymer comprising 10 wt% of ethylene-propylene copolymer dispersed in a polypropylene homopolymer wherein the polypropylene homopolymer has a MFI of 150 measured at 230°C under a load of 2.16 kg according to ISO 1133, and a cold xylene soluble fraction of the ethylene-propylene copolymer has an intrinsic viscosity of 7.0 dl/g measured in decalin at 135°C.
  • Glass fibers 10 to 20 micrometer diameter 12.5 mm long SABIC's innovative Plastics business GF4 40 wt% glass fibers in PP. Glass fibers, 13 micrometer diameter, 4.5 mm long with a total MFI of 15 (ISO1133, 2.16 kg, 230°C) SABIC's innovative Plastics business Coupling Agent Maleic anhydride (MAh) functionalized homopolypropylene produced by reactive extrusion.
  • MAh Maleic anhydride
  • compositions A and B were mixed together and injected molded using a standard machine equipped with a three-zone screw typically used for mineral filled polypropylene compounds at a temperature of 240°C.
  • the melt flow index and the ash content were determined for Compositions A and B and are shown in Table 2.
  • compositions of Examples 1-6 were prepared by mixing one of Compositions A and B with glass fibers as shown in Table 3. The mechanical properties were determined and are also shown in Table 3. Table 3 Example 1 2 3 4 5 6 Composition A A B B A B Composition (wt%) 85 70 85 70 77.5 77.5 GF3 (wt%) 15 30 15 30 - - GF4 (wt%) - - - - 22.5 22.5 Total (wt%) 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 Mechanical Properties
  • Table 3 shows that all of Examples 1-6 resulted in compositions with good notched Izod impact strength at 23°C of greater than 20 kJ/m 2 , specifically, greater than 29 kJ/m 2 .
  • Table 3 further shows that Example 4 exhibits good flexural strength of greater than 1400 MPa and Examples 1, 2, and 5 exhibit good gloss values of less than 50 at 60°.
  • Examples 7-18 were prepared by mixing the components as recited in Table 4 together and injection molding the mixture using a standard machine equipped with a three-zone screw typically used for mineral filled polypropylene compounds at a temperature of 200°C.
  • Examples 9-13 and 16-18 comprise Tospearl silicone particles, whereas Examples 7, 8, and 14 and 15 do not.
  • the melt flow index, the melt volume index, and the ash content were determined and are also shown in Table 4.
  • Table 4 shows that the presence of the silicone particles does not reduce the melt flow properties or increase the ash content.
  • Example 7 The notched Izod impact properties of Examples 7-15 were determined and are shown in the below Table 5.
  • Table 5 Example 7 8 9 10 11 12 13 14 15 Notched Izod impact at 23°C (Parallel) (ISO 180/4A) Izod impact (kJ/m 2 ) 21.47 35.38 - - - - 32.33 33.51 33.43 Izod Impact S.D.
  • Table 5 shows that adding a coupling agent can result in an increase in mechanical properties, where all of Examples 8-15 display increased notched Izod impact properties as compared to Example 7.
  • Examples 9-13 further show that compositions comprising the silicone particles are able to maintain comparable notched Izod impact properties as compared to compositions that do not comprise the silicone particles (see Examples 8, 14, and 15).
  • Tables 6 (above) and 7 (below) show that the presence of the silicone particles surprisingly results in an increase in flexural and tensile properties, where Examples 9-12 and 16-18 all show increase flexural moduli, flexural strength, and tensile moduli values as compared to Example 8 that comprises a corresponding amount of coupling agent, but does not comprise the silicone particles.
  • a comparison of Example 13 to Example 9 shows that increasing the amount of coupling agent can further increase the flexural properties and the tensile modulus in the soft touch compositions.
  • Table 8 shows that adding silicone particles results in a decrease in gloss properties, where Examples 8, 9, and 11 and Examples 10 and 12 that have increasing amounts of silicone particles all show reducing gloss values at both particles sizes.
  • Table 9 shows that adding silicone particles results in an increase in shrinkage properties where Examples 9 and 10 all display increased shrinkage as compared to Example 8. Comparing Examples 10 and 12 to Examples 9 and 11, respectively, show that increasing the amount of silicone particles with a 6 micrometer particles size results in some increase in shrinkage (see Examples 9 and 11), whereas increasing the amount of silicone particles with a 2 micrometer particle size from 1 to 5 wt% resulted in little or no change in shrinkage values.
  • Table 9 also shows that adding silicone particles surprisingly results in a decrease in warpage, where Example 8 shows higher warpage values as compared to those of Examples 9-12. Table 9 further shows that increasing the diameter from 2 to 6 micrometers and concentration from 1 to 5 weight percent of the siloxane particles results in an increase in warpage.
  • Table 10 shows that the examples display good Erichsen scratch data with dL values of less than 1.5. Table 10 also shows that Examples 10-12 and 16-18 comprising silicone particles result in decreased coefficients of static and dynamic friction.
  • Examples 16-19 were prepared as above-described for Examples 7-15. Their compositions are described in Table 11.
  • the haptic properties of Examples 8, 10, 13, and 16-19 were determined by a panel of 7 to 13 experts in material properties. Specifically, the experts felt the surface of the respective compositions and assigned it a haptic rating of 1 to 5, where a haptic rating of 1 was the best and 5 was the worst. The averages of the ratings for each surface was determined and are shown in Table 11, where it is noted that Examples 10 and 18 are the same compositions except for the injection speeds of 30 and 60 mm/s, respectfully.
  • Table 11 shows that compositions comprising 6 micrometer silicone particles have the best haptic ratings of 1. Table 11 also shows that increasing the injection speed can result in a reduction in haptic properties, where Examples 10 and 18 were prepared with injection speeds of 30 and 60 mm/s, respectively, and resulted in haptic ratings of 2 and 3, respectively.
  • the haptic properties of Examples 16-18 were determined by a panel of 9 experts in soft touch properties. Specifically, the experts felt the surface of the respective compositions and assigned it a haptic rating of 1 to 3, where a haptic rating of 1 was the best and 3 was the worst. The averages of the ratings for each surface of Examples 16, 17, and 18 were 1.1, 2.5, and 2.4, respectfully.
  • Example 16 had excellent haptic properties. This could be due to the presence of a heterophasic polymer comprising greater than or equal to 20 wt% of ethylene-propylene copolymer dispersed in a polypropylene homopolymer with an MFI of less than or equal to 65 measured at 230°C under a load of 2.16 kg according to ISO 1133, and a cold xylene soluble fraction of the ethylene-propylene copolymer has an intrinsic viscosity of 2.5 to 6.5 dl/g measured in decalin at 135°C.
  • the invention may alternately comprise, consist of, or consist essentially of, any appropriate components herein disclosed.
  • the invention may additionally, or alternatively, be formulated so as to be devoid, or substantially free, of any components, materials, ingredients, adjuvants or species used in the prior art compositions or that are otherwise not necessary to the achievement of the function and/or objectives of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (16)

  1. Une composition au toucher doux comprenant, par rapport au poids total de la composition,
    10 à 40 % pds de fibres de verre; et
    50 à 88 % pds d'un polymère comprenant, par rapport au poids total du polymère,
    44 à 52 % pds d'un homopolymère de polypropylène,
    3 à 30 % pds d'un copolymère d'éthylène et de propylène, et
    22 à 52 % pds d'un copolymère d'éthylène et d'alpha-oléfine en C4 à C8.
  2. Composition selon la revendication 1, dans laquelle l'homopolymère de polypropylène a un indice de fluidité à chaud de 5 à 150 g/10 min, mesuré à 230 °C sous 2.16 kg, conformément à la norme ISO 1133.
  3. Composition selon l'une quelconque des revendications 1 à 2, dans laquelle une fraction soluble de xylène froide du copolymère d'éthylène et de propylène a une viscosité intrinsèque de 2 à 8 dl/g, de préférence de 3 à 8 dl/g, mesurée dans la décaline à 135 °C.
  4. Composition selon l'une quelconque des revendications 1 à 3, dans laquelle le copolymère d'éthylène et d'alpha-oléfine en C4 à C8 est polymérisé à partir d'éthylène et d'au moins l'un parmi le 1-butène, le 1-hexène et le 1-octène.
  5. Composition selon l'une quelconque des revendications 1 à 4, dans laquelle le copolymère d'éthylène et d'alpha-oléfine en C4 à C8 a une densité de 850 à 880 kg/m3 et un indice de fluidité à chaud de 0.5 à 35 g/10 min, mesuré à 190 °C sous 2.16 kg conformément à la norme ISO 1133.
  6. Composition selon l'une quelconque des revendications 1 à 5, dans laquelle les fibres de verre ont un diamètre de filament de 10 à 20 micromètres.
  7. Composition selon l'une quelconque des revendications 1 à 6, comprenant en outre du polypropylène modifié, dans laquelle un polypropylène modifié est un polypropylène greffé avec un acide carboxylique ou ses sels, un anhydride, un ester ou une combinaison comprenant au moins l'un des précédents, de préférence dans laquelle le polypropylène modifié est présent en une quantité de 0.1 à 4 % pds, par rapport au poids total de la composition.
  8. Composition selon la revendication 7, dans laquelle le polypropylène modifié est un homopolymère de polypropylène greffé avec de l'anhydride maléique, de préférence dans lequel un groupe fonctionnel dérivé de l'anhydride maléique est présent en une quantité supérieure ou égale à 0.5 % pds, par rapport au poids total du polypropylène modifié.
  9. Composition selon l'une quelconque des revendications 1 à 8, comprenant en outre une particule de silicone ayant la formule (I)

            RxSi02-(x/2)     (I)

    dans laquelle x est un nombre positif supérieur ou égal à 1 et chaque R est indépendamment un groupe hydrocarboné aliphatique, un hydrocarbure aromatique ou un groupe insaturé.
  10. Composition selon la revendication 9, dans laquelle la particule de silicone comprend du méthylsilséquioxane, la particule de silicone ayant un diamètre moyen de particule de 1.8 à 10.5 micromètres.
  11. Composition selon la revendication 9 ou 10, dans laquelle la particule de silicone comprend du méthylsilséquioxane, la particule de silicone étant présente en une quantité de 1 à 5 % pds, par rapport au poids total de la composition.
  12. Composition selon l'une quelconque des revendications 1 à 11, comprenant en outre 0.1 à 5 % pds d'un colorant.
  13. Composition selon l'une quelconque des revendications 1 à 12, comprenant en outre un polysiloxane, dans laquelle le polysiloxane comprend un polysiloxane à poids moléculaire ultra-haut avec une viscosité cinématique supérieure à 10 x 106 centistokes, déterminée conformément à la norme ASTM D445.
  14. Composition selon l'une quelconque des revendications 1 à 13, dans laquelle le polysiloxane est présent en une quantité de 0.2 à 10 % pds.
  15. Composition selon l'une quelconque des revendications 1 à 14, dans laquelle la composition comprend en outre 0.1 à 2 % pds d'un stabilisant thermique, d'un stabilisant UV, d'un stabilisant lumière visible, d'un antioxydant ou d'une combinaison comprenant un ou plusieurs des précédents.
  16. Article fabriqué à partir de la composition de l'une quelconque des revendications 1 à 15.
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